Keysight Technologies FieldFox A Series, User Manual

Page: 613 / 756

Data Analysis Features
All about Limit Lines
Keysight N9927-90001 User’s Guide 613
All about Limit Lines
Limit lines are visual representations, drawn on the FieldFox screen, of the specified limits for a
measurement. With this capability, you can easily compare measured data versus specifications.
Optionally, you can enable an audible beep and display Pass or Fail information for each
measurement.
— You can have up to as many limit line segments as there are data points for each measurement
trace allowing you to test all aspects of your measurements.
— Limit lines are available in CAT Mode, NA Mode, NF Mode, and SA Mode. Power Meter Mode
uses different limit settings. Learn more in “Limits” on page 458 .
— Limit lines and limit testing are NOT allowed in NA Mode with Smith Chart or Polar display
formats.
— A simple Display Line is also available in I/Q Analyzer, NF, and SA Modes ONLY. Learn more in
“Display Line (I/Q, NF, and SA Modes Only)” on page 617 .
— Limit lines can be saved and recalled with an *.sta file. Learn more in “How to Save and Recall
Limits” on page 616 . They can also be saved and recalled independently from the Limit softkeys.
Learn more in “How to Save and Recall Limits” on page 616 .
How to Create Fixed Limit Lines
There are two ways to build a Fixed limit line:
1. 1. Build (limits) From a Trace. Learn how in “Build From Trace” on page 614 .
2. Enter X/Y data points into the on-screen editor. The limit line is formed as the FieldFox
‘connects the dots’ on the screen. To create frequency gaps that are NOT tested, use separate
limit lines. The X-axis values for two lines can overlap.
— Press Limit 8 .
— Then Edit Limits . A limit line table appears.
— Use the Up / Down arrows and rotary knob to navigate the cursor to the following editable cells.
— Description - Press Edit , then enter a description for the limit line using the FieldFox
labeler. Learn how in “How to use the FieldFox labeler ” on page 674 .
— Fixed/Relative – Press Edit to toggle between the following:
—— Fixed - the limit line does not move. The X/Y coordinates are absolute locations on
the screen.
—— Relative - the limit line moves relative to the center frequency and acquisition.
Note : It is easiest to first create Fixed Limits, then change this setting to Relative.
Learn more “Relative Limit Lines” on page 614 .
— Upper/Lower – Press Edit to toggle between the following:
IMPORTANT! For CAT and NA modes, limit lines do not apply
where F1 = F2.